| Schedule of Segment Reporting Information, by Segment [Text Block] |
Results of operations for the reportable segments were as follows: | | | | | | | | | | | | | | | | | | Three Months Ended June 30, | | Six Months Ended June 30, | | 2012 | | 2011 | | 2012 | | 2011 | | (Thousands of Dollars) | Revenues: | | | | | | | | Storage: | | | | | | | | Third parties | $ | 133,187 |
| | $ | 127,646 |
| | $ | 260,874 |
| | $ | 252,899 |
| Intersegment | 18,818 |
| | 11,491 |
| | 35,863 |
| | 22,883 |
| Related party | 788 |
| | 407 |
| | 1,485 |
| | 537 |
| Total storage | 152,793 |
| | 139,544 |
| | 298,222 |
| | 276,319 |
| Transportation: | | | | | | | | Third parties | 74,607 |
| | 71,562 |
| | 152,368 |
| | 144,572 |
| Intersegment | 1,011 |
| | — |
| | 1,011 |
| | — |
| Total transportation | 75,618 |
| | 71,562 |
| | 153,379 |
| | 144,572 |
| Asphalt and fuels marketing: | | | | | | | | Third parties | 1,693,323 |
| | 1,389,569 |
| | 3,222,870 |
| | 2,425,792 |
| Intersegment | 178 |
| | 749 |
| | 307 |
| | 4,594 |
| Total asphalt and fuels marketing | 1,693,501 |
| | 1,390,318 |
| | 3,223,177 |
| | 2,430,386 |
| Consolidation and intersegment eliminations | (20,007 | ) | | (12,240 | ) | | (37,181 | ) | | (27,477 | ) | Total revenues | $ | 1,901,905 |
| | $ | 1,589,184 |
| | $ | 3,637,597 |
| | $ | 2,823,800 |
| | | | | | | | | Operating income: | | | | | | | | Storage | $ | 54,127 |
| | $ | 42,848 |
| | $ | 110,274 |
| | $ | 91,544 |
| Transportation | 31,870 |
| | 30,163 |
| | 68,821 |
| | 64,560 |
| Asphalt and fuels marketing | (292,539 | ) | | 72,153 |
| | (308,314 | ) | | 72,271 |
| Consolidation and intersegment eliminations | (25 | ) | | (110 | ) | | (26 | ) | | (45 | ) | Total segment operating (loss) income | (206,567 | ) | | 145,054 |
| | (129,245 | ) | | 228,330 |
| General and administrative expenses | (23,135 | ) | | (26,119 | ) | | (50,322 | ) | | (52,102 | ) | Other depreciation and amortization expense | (2,039 | ) | | (1,584 | ) | | (3,853 | ) | | (3,146 | ) | Other asset impairment loss | (3,295 | ) | | — |
| | (3,295 | ) | | — |
| Gain on legal settlement | 28,738 |
| | — |
| | 28,738 |
| | — |
| Total operating (loss) income | $ | (206,298 | ) | | $ | 117,351 |
| | $ | (157,977 | ) | | $ | 173,082 |
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| Schedule of Segment Reporting Information Assets By Segment [Text Block] |
Total assets by reportable segment were as follows: | | | | | | | | | | June 30,
2012 | | December 31,
2011 | | (Thousands of Dollars) | Storage | $ | 2,599,600 |
| | $ | 2,597,904 |
| Transportation | 1,304,160 |
| | 1,251,474 |
| Asphalt and fuels marketing | 1,490,107 |
| | 1,717,960 |
| Total segment assets | 5,393,867 |
| | 5,567,338 |
| Other partnership assets | 323,731 |
| | 313,852 |
| Total consolidated assets | $ | 5,717,598 |
| | $ | 5,881,190 |
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